tracepaths

ENS_PART.tracepaths(variables: List[Any] | None = None) → List[Any]

This method returns the point and time values of particle traces.

For an pyensight.ens_part_particle_trace.ENS_PART_PARTICLE_TRACE instance, this method will return the data spce coordinates and time of each particle trace point. Optionally, it can return variable values sampled at those coordinates.

Args:

variables:

An optional list of variable references. A mixture of ENS_VAR objects, variable names (string) or variable ids (integers) is allowed.

Returns:

If variables is not specified, the return value is a list of lists. There is one list for each trace. Each point withing the trace list is represented as a list of four floats representing the x,y,z,t values for the point:

[[[x0,y0,z0,t0], [x1,y1,z1,t1], ...], [trace 2], ... ]

If variables is specified, the return value is a list of lists of lists. There is one list for each trace, one list for each point and a list of lists for each variable. For a scalar field ‘a’ and a vector field ‘b’:

[[[[a0], [b0x,b0y,b0z]], [[a1], [b1,b1y,b1z]], ...], [trace 2], ...]

Example:

# get the particle trace part
p = session.ensight.objs.core.PARTS["particletrace"][0]
# get the coordinates of the 5th trace
traces = p.tracepaths()
coords = []
# walk the 5th trace
for point in traces[5]:
    coords.append(point[0:3])
print(f"Coords = {coords}")
# get the velocity (vector) and pressure (scalar) values
# on the particle trace points from the 5th trace
traces = p.tracepaths(variables=["velocity", "pressure"])
pressure = []
velocity = []
# walk the 5th trace
for point in traces[5]:
    velocity.append(point[0])   # velocity is first in variables
    pressure.append(point[1][0])  # grab just the pressure scalar value
print(f"Velocities = {velocity}")
print(f"Pressure = {pressure}")